Pressurized Thermogravimetric Study on the Hydropyrolysis and Hydrogasification Kinetics of a Bituminous Coal

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• 作者：Linbo Yan ; Boshu He ; Tianyi Hao ; Xiaohui Pei ; Xusheng Li ; Chaojun Wang ; Zhipeng Duan
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：May 15, 2014
• 年：2014
• 卷：28
• 期：5
• 页码：2993-3001
• 全文大小：553K
• 年卷期：v.28,no.5(May 15, 2014)
• ISSN：1520-5029

文摘

Coal hydropyrolysis (CHP) and coal hydrogasification (CHG) are two important processes during coal conversion in a hydrogen atmosphere. Much attention has been paid on this clean coal conversion technology because of its advantages. In this work, the CHP and CHG kinetic characteristics of a bituminous coal are studied in a pressurized thermogravimetric analyzer (P-TGA). The effects of the pressure on the CHP and CHG kinetics of the bituminous coal are detected with the non-isothermal thermogravimetric method. In addition, the kinetic compensation effect (KCE) and isokinetic points of the two processes are investigated. Besides, the kinetic triplets, including the pre-exponent factor, the activation energy and mechanism function are also calculated and defined for all of the cases during the CHP and CHG processes. Meaningful and interesting conclusions are finally obtained from this study. The initial pyrolysis temperature will increase with the reaction pressure when the pressure is within 3 MPa. The appearing time of the weight loss peak rate will be delayed when the pressure is lower than 2 MPa, and then it will become earlier gradually with the pressure increment. The weight loss peak rate will decrease sharply when the pressure is increased from 0.1 to 1 MPa, and then it will increase gradually with the reaction pressure increment. The KCE phenomenon during the CHP process is not detected, and the isokinetic point is not found. The KCE can be detected during the CHG process when the reaction pressure is within 3 MPa and the isokinetic point temperature is found as 1041.0 K.